Motor ?

T Gibbs

Member

T

Join Date

Jun 2012

Location

Morristown, TN

Posts

406

• Jun 23, 2014

• #1

I'm hooking up a machine and started to connect the motor. There is no diagram or nameplate on it and none of the terminals are marked. I've never seen one like this. It has the cords already hooked up in it and I'm trying to figure out how to hook up the other end using "across the line" start.

 

T Gibbs

Member

OP

T

Join Date

Jun 2012

Location

Morristown, TN

Posts

406

• Jun 23, 2014

• #2

Here are some close up pics of the 2 connection areas

 

geniusintraining

Lifetime Supporting Member + Moderator

Join Date

Jun 2005

Location

SC

Posts

8,274

• Jun 23, 2014

• #3

The peckerhead on the right just looks like a Y or Star connection with a thermal trip

What does the motor do?

 

T Gibbs

Member

OP

T

Join Date

Jun 2012

Location

Morristown, TN

Posts

406

• Jun 23, 2014

• #4

It's in a punch press, made in England, original controls were German.

 

OkiePC

Lifetime Supporting Member

Join Date

Mar 2005

Location

ENE of Nowhere Oklahoma

Posts

11,791

• Jun 23, 2014

• #5

Looks like a slip ring motor perhaps? I have never dealt with one. With that said, it looks to be wired between the two connection points already?

I would have fun with an ohmmeter and a notepad for sure, but first, I might call "S.M.A. Industrial Services Ltd" and pick their brains about it.

I would guess that you bolt your 3 phases to the connections on the right, but I would ohm them first and do my darndest to find a spec sheet on this motor. Then, before you throw the juice to it, if there remain any doubts, make sure there exists a spare

 

Last edited: Jun 23, 2014

T Gibbs

Member

OP

T

Join Date

Jun 2012

Location

Morristown, TN

Posts

406

• Jun 23, 2014

• #6

OkiePC said:

Looks like a slip ring motor perhaps? I have never dealt with one. With that said, it looks to be wired between the two connection points already?

I would have fun with an ohmmeter and a notepad for sure.

Click to expand...

There is a cord coming from each of the peckerheads to go to the control cabinet. One went to the main contactor, the other went to a star-delta contactor, I think.

I've tried the ohmmeter. Set on meg-ohms, if I read between any terminal of one connection box and any terminal of the other connection box, it starts around 60 and climbs, continuously.

 

osmanmom

Member

O

Join Date

Mar 2014

Location

JOHOR

Posts

1,457

• Jun 23, 2014

• #7

ac slip ring high torque use for heavy duty

 

OkiePC

Lifetime Supporting Member

Join Date

Mar 2005

Location

ENE of Nowhere Oklahoma

Posts

11,791

• Jun 23, 2014

• #8

60megohms? So they are separate circuits, and I admit have no idea what to do with the one on the left...

The one on the right, verify you have balanced ohm readings between the studs and that they are not grounded.

I have seen some old systems where slip rings from one motor fed to another motor circuit, but they were small positioning motors built quite differently than what you have. What does this motor do?

 

T Gibbs

Member

OP

T

Join Date

Jun 2012

Location

Morristown, TN

Posts

406

• Jun 23, 2014

• #9

Thank You, OkiePC. I had never heard of a slip ring motor. I googled it and you are correct, it is. Now I have to figure out how this thing works and what I need to do to control it.

 

alittlethiny

Member

A

Join Date

Dec 2013

Location

Minnesota

Posts

13

• Jun 23, 2014

• #10

It looks like a synchronous motor designed with dynamic braking.

 

T Gibbs

Member

OP

T

Join Date

Jun 2012

Location

Morristown, TN

Posts

406

• Jun 23, 2014

• #11

The one on the left is the power feed. The one on the right is the slip rings and you have to put external resistance across them to control the speed of the motor, from what I am understanding.

 

Lancie1

Lifetime Supporting Member

Join Date

Jul 2003

Location

Alabama

Posts

9,999

• Jun 23, 2014

• #12

first, I might call "S.M.A. Industrial Services Ltd" and pick their brains about it.

Click to expand...

Here is SMA's contact info, Phone, and E-mail address. Possibly SMA has wiring diagrams for this type of motor.

http://www.smaindustrial.co.uk/index.php

 

alittlethiny

Member

A

Join Date

Dec 2013

Location

Minnesota

Posts

13

• Jun 23, 2014

• #13

T Gibbs said:

The one on the left is the power feed. The one on the right is the slip rings and you have to put external resistance across them to control the speed of the motor, from what I am understanding.

Click to expand...

Take a look at this.

http://encyclopedia2.thefreedictionary.com/Dynamic+Braking+of+Electric+Drive

 

geniusintraining

Lifetime Supporting Member + Moderator

Join Date

Jun 2005

Location

SC

Posts

8,274

• Jun 23, 2014

• #14

?? this is a nice drawing but the link does not work

http://www.google.com/imgres?imgurl...act=rc&uact=3&dur=1544&page=1&start=0&ndsp=41

I am sure they would have more info but their site is down

 

Lancie1

Lifetime Supporting Member

Join Date

Jul 2003

Location

Alabama

Posts

9,999

• Jun 23, 2014

• #15

The one on the right is the slip rings and you have to put external resistance across them to control the speed of the motor, from what I am understanding.

Click to expand...

It appears that the slip rings are 3-phase, 1 phase bare, 1 marked yellow, 1 marked blue. If so, this could be a wound-rotor motor, with a rotor having a coil fed by slip rings (instead of the usual induced-current rotor). The speed of a wound-rotor motor can be changed by changing the resistance between A-B, B-C and C-A of the wound rotor leads. Before electronic VFDs, wound rotor motors were used in cranes and other large loads.